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[RESOLVED] System Error

Hi,
I'm new to ajax, and i try to make a simpe test but i alwas got the system error -1072896748 when i'm calling a page use sing the GET method like : http.open('GET', 'script.php?action=test');

Code:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>Document sans nom</title>
<script>
function createRequestObject(){
var request_o; //declare the variable to hold the object.
var browser = navigator.appName; //find the browser name
if(browser == "Microsoft Internet Explorer"){
/* Create the object using MSIE's method */
request_o = new ActiveXObject("Microsoft.XMLHTTP");
}else{
/* Create the object using other browser's method */
request_o = new XMLHttpRequest();
}
return request_o; //return the object
}
/* You can get more specific with version information by using
parseInt(navigator.appVersion)
Which will extract an integer value containing the version
of the browser being used.
*/
/* The variable http will hold our new XMLHttpRequest object. */
var http = createRequestObject();
/* Function called to get the product categories list */
function test(){
/* Create the request. The first argument to the open function is the method (POST/GET),
and the second argument is the url...
document contains references to all items on the page
We can reference document.form_category_select.select_category_select and we will
be referencing the dropdown list. The selectedIndex property will give us the
index of the selected item.
*/
http.open('GET', 'script.php?action=test');
/* Define a function to call once a response has been received. This will be our
handleProductCategories function that we define below. */
http.onreadystatechange = handle;
/* Send the data. We use something other than null when we are sending using the POST
method. */
http.send(null);
}
/* Function called to handle the list that was returned from the internal_request.php file.. */
function handle(){
/* Make sure that the transaction has finished. The XMLHttpRequest object
has a property called readyState with several states:
0: Uninitialized
1: Loading
2: Loaded
3: Interactive
4: Finished */
if(http.readyState == 4){ //Finished loading the response
/* We have got the response from the server-side script,
let's see just what it was. using the responseText property of
the XMLHttpRequest object. */
var response = http.responseText;
/* And now we want to change the product_categories <div> content.
we do this using an ability to get/change the content of a page element
that we can find: innerHTML. */
//document.getElementById('product_cage').innerHTML = response;
alert(response);
}
}
</script>
</head>
<body>
<a href="#" onclick="test()">[test]</a>
<div id="main"></div>
</body>
</html>